Goodwill, Customer Relationships and Other Intangible Assets - Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 1,964	$ 1,964
Indefinite-lived intangible assets	0	9
Total other intangible assets, net	4,660	4,806
Customer Relationships
Goodwill [Line Items]
Other intangible assets subject to amortization	3,048	3,196
Accumulated amortization	4,499	4,504
Capitalized Software
Goodwill [Line Items]
Other intangible assets subject to amortization	1,544	1,529
Accumulated amortization	3,776	4,067
Patents and Other
Goodwill [Line Items]
Other intangible assets subject to amortization	68	72
Accumulated amortization	$ 89	86
Fully Amortized and Retired Customer Relationships
Goodwill [Line Items]
Gross carrying value		161
Fully Amortized and Retired Capitalized Software
Goodwill [Line Items]
Gross carrying value		$ 211